1 /*
2  * Copyright (C) 2021-2022 Huawei Device Co., Ltd.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 #ifndef OHOS_DHCP_OPTION_H
17 #define OHOS_DHCP_OPTION_H
18 
19 #include <stddef.h>
20 #include <stdint.h>
21 
22 #define DHCP_OPTION_SIZE 256
23 #define DHCP_END_OPTION_CODE 255
24 
25 #ifdef __cplusplus
26 extern "C" {
27 #endif
28 
29 typedef struct DhcpOption DhcpOption;
30 struct DhcpOption {
31     uint8_t code;
32     uint8_t length;
33     uint8_t data[DHCP_OPTION_SIZE];
34 };
35 typedef struct DhcpOption *PDhcpOption;
36 
37 typedef struct DhcpOptionNode DhcpOptionNode;
38 struct DhcpOptionNode {
39     struct DhcpOptionNode *previous;
40     struct DhcpOptionNode *next;
41     DhcpOption option;
42 };
43 typedef struct DhcpOptionNode *PDhcpOptionNode;
44 
45 typedef struct DhcpOptionList DhcpOptionList;
46 struct DhcpOptionList {
47     PDhcpOptionNode first;
48     PDhcpOptionNode last;
49     size_t size;
50 };
51 typedef struct DhcpOptionList *PDhcpOptionList;
52 
53 int InitOptionList(PDhcpOptionList pOptions);
54 int HasInitialized(PDhcpOptionList pOptions);
55 int PushBackOption(PDhcpOptionList pOptions, PDhcpOption option);
56 int PushFrontOption(PDhcpOptionList pOptions, PDhcpOption option);
57 int RemoveOption(PDhcpOptionList pOptions, uint8_t code);
58 PDhcpOptionNode GetOptionNode(PDhcpOptionList pOptions, uint8_t code);
59 PDhcpOption GetOption(PDhcpOptionList pOptions, uint8_t code);
60 void ClearOptions(PDhcpOptionList pOptions);
61 void FreeOptionList(PDhcpOptionList pOptions);
62 int FillOption(PDhcpOption pOption, const char *data, size_t len);
63 int FillU32Option(PDhcpOption pOption, uint32_t u32);
64 int FillOptionData(PDhcpOption pOption, const uint8_t *data, size_t len);
65 int AppendAddressOption(PDhcpOption pOption, uint32_t address);
66 
67 #ifdef __cplusplus
68 }
69 #endif
70 #endif
71